COMBINED EMBOLIZATION AND SURGICAL-TREATMENT OF ARTERIOVENOUS MALFORMATION OF THE ORBIT

We examined three patients with arteriovenous malformation of the orbit. At initial examination, all patients had a slowly progressive mass effect combined with congestive symptoms and clinical signs typical of an orbital vascular lesion. Arteriovenous malformation of the orbit was diagnosed on the basis of clinical and radiographic assessment, including the use of digital subtraction angiography and in one patient, magnetic resonance imaging. Treatment of each patient involved neuroradiologic embolization of the vascular lesion followed by surgical excision. Transient complications of endovascular management occurred. In one patient particulate emboli migrated into the central retinal artery after postembolization orbital surgical excision; consequent focal ischemic retinopathy contributed to short-term visual field deficits, which eventually resolved spontaneously. In another patient, spasm of the ophthalmic artery occurred during embolization, resulting in a transient afferent pupillary defect and loss in visual acuity to 20/60, which resolved over the subsequent week. High-flow orbital vascular lesions represent a considerable treatment challenge because of the complex anatomic and hemorrhagic characteristics of the malformation. Neuroradiologic characterization and embolization as a preoperative adjuvant is not without risk but offers an important advantage in the treatment of these formidable lesions. A combination of endovascular and surgical management may allow otherwise inoperable lesions to be treated successfully.